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Old 02-14-2014, 12:09 PM
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2004 6.0 No heat and overheats

I have read a ton of posts about this but none seem to fit exactly what mine is doing and i am relatively new to the 6.0. At idle the truck has no heat,as soon as you accelerate heater blows hot instantly.I pull a boat that weighs approx 3500lbs.When pulling up an incline it will do fine until about the time the aux fan kicks on.The eng temp is at normal and will spike to hot in a couple of seconds with the overheat light coming on.I let off the gas and pull over and it will go back to normal temp in a few seconds.It only does this when pulling uphill,on flat ground it hauls with no problems.
I have deleted the egr,replaced thermostat,oil cooler,degas cap,flushed system and i have no coolant loss.The truck does have a banks six gun which i turn down to 1 when pulling,it also has exhaust and air intake.
Any ideas or help would be greatly appreciated thanks.
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Old 02-14-2014, 12:22 PM
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Waterpump.
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Old 02-14-2014, 12:35 PM
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Hmm I had to think about that and reread the op's info

but your right it sounds like it may be a lack of circulation
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Old 02-14-2014, 12:48 PM
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Is it possible the belt tensioner is going, causing belt to slip. ???
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Old 02-14-2014, 01:57 PM
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Thanks for the fast responses guys.Since i have had this issue i have replaced the oil cooler and had no change.Could it have blockage elsewhere or just in the cooler itelf?I think i am leaning toward replacing the water pump since it sounds like they have an impeller problem?Sounds like the bulletproof pump is the best way to go?thanks
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Old 02-14-2014, 02:21 PM
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I just got done dealing with an oil cooler
my oil cooler was plugged on the coolant side and the only affect I had was the oil temps 135*

ECT and heater were fine 190*


you will know right away if your water pump impeller is to blame upon removal the BPD pump is nice but other than the billet impeller and quality bearings it really offers no advantages
other than it can be rebuilt

Last edited by ZMANN; 02-14-2014 at 02:24 PM.
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Old 02-14-2014, 02:26 PM
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Quote:
Originally Posted by 200460 View Post
I think i am leaning toward replacing the water pump since it sounds like they have an impeller problem?Sounds like the bulletproof pump is the best way to go?thanks
The stock waterpump has a plastic impeller. The Bulletproof is a billet impeller.
Guess which one I have under the hood of my truck......
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Old 02-17-2014, 08:13 PM
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Quote:
Originally Posted by 200460 View Post
I have read a ton of posts about this but none seem to fit exactly what mine is doing and i am relatively new to the 6.0. At idle the truck has no heat,as soon as you accelerate heater blows hot instantly.I pull a boat that weighs approx 3500lbs.When pulling up an incline it will do fine until about the time the aux fan kicks on.The eng temp is at normal and will spike to hot in a couple of seconds with the overheat light coming on.I let off the gas and pull over and it will go back to normal temp in a few seconds.It only does this when pulling uphill,on flat ground it hauls with no problems.
I have deleted the egr,replaced thermostat,oil cooler,degas cap,flushed system and i have no coolant loss.The truck does have a banks six gun which i turn down to 1 when pulling,it also has exhaust and air intake.
Any ideas or help would be greatly appreciated thanks.
Just realized that my truck too is not putting out heat at idle but as soon as I accelerate it blows heat. No overheating problem and deltas stay within 10*. Interested to see what you find.
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Old 02-17-2014, 08:22 PM
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I vote for water pump too. I just put a bpd water pump on my truck. Beautiful piece of equipment..
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Old 02-18-2014, 07:23 PM
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No heat at idle causes are water pump as stated, low coolant level, thermostat, head gasket.
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